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Open AccessArticle

Design and Validation of a Holographic Particle Counter

1
Photonic Systems, CTR Carinthian Tech Research AG, 9524 Villach/St. Magdalen, Austria
2
Institute of Electronic Sensor Systems, Graz University of Technology, 8010 Graz, Austria
3
Nanophysics & Sensor Technologies, AVL List GmbH, 8020 Graz, Austria
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(22), 4899; https://doi.org/10.3390/s19224899
Received: 19 September 2019 / Revised: 21 October 2019 / Accepted: 6 November 2019 / Published: 9 November 2019
(This article belongs to the Special Issue Photonics-Based Sensors for Environment and Pollution Monitoring)
An in-line holographic particle counter concept is presented and validated where multiple micrometer sized particles are detected in a three dimensional sampling volume, all at once. The proposed Particle Imaging Unit is capable of detecting holograms of particles which sizes are in the lower μ m- range. The detection and counting principle is based on common image processing techniques using a customized Hough Transform with a result directly relating to the particle number concentration in the recorded sampling volume. The proposed counting unit is mounted ontop of a Condensation Nucleus Magnifier for comparison with a commercial TSI-3775 Condensation Particle Counter (CPC). The concept does not only allow for a precise in-situ determination of low particle number concentrations but also enables easy upscaling to higher particle densities (e.g., > 30.000 # c c m ) through its linear expandability and option of cascading. The impact of coincidence at higher particle densities is shown and two coincidence correction approaches are presented where, at last, its analogy to the coincidence correction methods used in state-of-the-art CPCs is identified. View Full-Text
Keywords: Condensation Particle Counter; in-line holography; Hough Transform; coincidence correction Condensation Particle Counter; in-line holography; Hough Transform; coincidence correction
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MDPI and ACS Style

Brunnhofer, G.; Bergmann, A.; Klug, A.; Kraft, M. Design and Validation of a Holographic Particle Counter. Sensors 2019, 19, 4899.

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